Background and aims: Non-pharmaceutic approaches to the treatment of hoarding disorder (HD) use interventions based of cognitive-behavioral therapy (CBT). Inference-based therapy (IBT) focuses on the doubts which form the basis of preoccupation in HD and deals with ego syntonic values in hoarding by exposing how the hoarding-self sabotages the authentic self. The objective was to establish if the IBT would lead to the clinically significant decrease of hoarding symptoms.